CN111983957A - Combined power supply and power-on time sequence control method thereof - Google Patents
Combined power supply and power-on time sequence control method thereof Download PDFInfo
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- CN111983957A CN111983957A CN202010912964.9A CN202010912964A CN111983957A CN 111983957 A CN111983957 A CN 111983957A CN 202010912964 A CN202010912964 A CN 202010912964A CN 111983957 A CN111983957 A CN 111983957A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21119—Circuit for signal adaption, voltage level shift, filter noise
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Abstract
The invention discloses a combined power supply and a power-on time sequence control method thereof. The combined power supply comprises a negative output power supply module and a positive output power supply module; the input ends and the power ground ends of the negative output power supply module and the positive output power supply module are respectively and correspondingly connected to the input power supply positive end and the ground end of the power supply; the output ends and the ground wire ends of the negative output power supply module and the positive output power supply module are respectively connected to a negative power supply load and a positive power supply load; the ground wire ends of the negative output power module and the positive output power module are connected; the positive output power supply module is provided with an enabling end; the positive output power module outputs a positive voltage after the negative output power module outputs a negative voltage through the delay unit connected between the output end of the negative output power module and the output ground wire end. An MCU system is not needed, so that the negative influence of a timing control circuit caused by power-on reset is avoided; the circuit has simple structure, small volume and easy integration, and saves complex programming.
Description
Technical Field
The invention relates to a combined power supply and a power-on time sequence control method.
Background
Some combined power supplies have requirements on application occasions, the combined power supplies need to have positive and negative dual-voltage outputs, and the negative power supply needs to be powered on and output before the positive power supply, otherwise, the power utilization system is easily damaged. At present, the time sequence control technology of the combined power supply at home and abroad is mainly controlled by an MCU system. The power-on sequence control method has the following defects:
1. an auxiliary power supply is required to power the timing control circuit.
And 2, the MCU system needs to be reset when being electrified, and the I/O state in the reset stage is uncertain, so that the timing sequence is out of control easily caused by electrification.
3. It is difficult to achieve isolation between the sets of power supplies.
4. The circuit is complicated, a large PCB surface is needed, and miniaturization integration is difficult to realize.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a novel positive and negative output combined power supply and a power-on time sequence control method thereof, an MCU system is not needed, and the power-on time sequence control method has the advantages of simple circuit structure, small volume and easiness in integration.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a combined power supply comprises a negative output power supply module N1 and a positive output power supply module N2;
the input end VIN and the power ground end GND1 end of the negative output power module N1 are respectively and correspondingly connected to the input power positive end and the ground end of the power supply; the output end VOUT and the ground wire end GND2 of the negative output power supply module N1 are respectively connected to a negative power supply load;
an input end VIN and a power ground end GND1 end of the positive output power module N2 are respectively and correspondingly connected to an input power supply positive end and a ground end of the power supply; the output end VOUT and the ground end GND2 of the positive output power supply module N2 are respectively connected to a positive power supply load;
the ground wire end GND2 of the negative output power module N1 and the positive output power module N2 are connected;
the positive output power module N2 has an enable terminal; the positive output power module delays to output a positive voltage after the negative output power module outputs a negative voltage by outputting an enable signal to an enable terminal through a delay unit connected between an output terminal VOUT of the negative output power module N1 and an output ground terminal.
Further, the delay unit comprises an optocoupler N3, a resistor R1, a capacitor C1 and a voltage stabilizing diode VD 1;
an output ground wire end GND2 of the negative output power module N1 is connected to a cathode of a voltage stabilizing diode VD1 and one input end of an optocoupler N3 through a resistor R1, and an output end VOUT of the negative output power module N1 is connected to the other input end of the optocoupler N3 and an anode of the voltage stabilizing diode VD 1; one output end of the optocoupler N3 is connected with an enable end EN of the positive output power supply module N2, and one output end of the optocoupler N3 is connected with an input ground end GND1 of the positive output power supply module N2; and a capacitor C1 is connected between the two input ends of the optical coupler N3.
Further, when the enable signal of the enable terminal of the positive output power module N2 is at low level, the positive output power module N2 is triggered to enable to output a positive voltage.
A power-on time sequence control method of a combined power supply comprises the steps that the positive end and the ground end of an input power supply of a power supply are correspondingly connected to the input end VIN and the power supply ground end of a negative output power supply module N1 and a positive output power supply module N2 at the same time, and the negative output power supply module N1 is immediately started to output negative voltage;
the enable end of the positive output power module N2 is not triggered to be enabled, and no output signal exists;
the negative voltage output by the negative output power module N1 is delayed by the delay unit and triggers the enable terminal of the positive output power module N2, so that the positive output power module N2 outputs a positive voltage.
Further, the delay unit comprises an optical coupler N3, a resistor R1, a capacitor C1 and a voltage stabilizing diode VD 1;
an output ground wire end GND2 of the negative output power module N1 is connected to a cathode of a voltage stabilizing diode VD1 and one input end of an optocoupler N3 through a resistor R1, and an output end VOUT of the negative output power module N1 is connected to the other input end of the optocoupler N3 and an anode of the voltage stabilizing diode VD 1; one output end of the optocoupler N3 is connected with an enable end EN of the positive output power supply module N2, and one output end of the optocoupler N3 is connected with an input ground end GND1 of the positive output power supply module N2; and a capacitor C1 is connected between the two input ends of the optical coupler N3.
Further, the negative voltage output by the negative output power module N1 is limited by the resistor R1 and stabilized by the zener diode VD1 to charge the capacitor C1, and after a time t, the voltage across the capacitor C1 reaches the conduction voltage of the two input terminals of the optocoupler N3, a current conduction state is formed between the two input terminals, so that the two output terminals of the optocoupler form a conduction state, the enable terminal of the positive output power module N2 is pulled to a low level, the positive output power module N2 is triggered to enable, and the positive output power module N2 outputs a positive voltage.
The invention achieves the following beneficial effects:
1. the invention uses the delay unit (optical coupler and some external elements) to realize the time sequence control, and completely realizes the power-on time sequence control by hardware, and has no negative influence caused by power-on reset of the MCU system time sequence control circuit.
2. The output voltage of the negative output power module is controlled to the enable end of the positive output power module in a photoelectric coupling mode of the optical coupler, and the isolation performance of the combined power supply is not affected.
3. The method does not need an auxiliary power supply, has simple circuit structure, small volume and easy integration, and omits complicated programming.
Drawings
Fig. 1 is a functional block diagram of the method.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The functional block diagram of the combined power supply for positive and negative outputs of the invention is shown in figure 1. The negative power supply load is RL1 and the positive power supply load is RL 2. The combined power supply comprises a negative output power supply module N1, a positive output power supply module N2, an optocoupler N3, a resistor R1, a capacitor C1, a voltage stabilizing diode VD1 and the like. The positive output power supply block N2 has an enable control terminal and is active low.
The input positive and ground wires of the power supply are respectively connected with the input ends VIN of the negative output power module N1 and the positive output power module N2 and the ends of the power ground end GND1, the output end VOUT of the negative output power module N1 and the end of the ground wire GND2 are respectively connected with a negative power load, the output end VOUT of the positive output power module N2 and the end of the ground wire GND2 are respectively connected with a positive power load, and the end of the ground wire GND2 of the negative output power module N1 and the positive output power module N2 are mutually connected.
An output ground wire end GND2 of the negative output power module N1 is connected to a cathode of the voltage stabilizing diode VD1 and a pin 1 of the optocoupler N3 through a resistor R1, and an output end VOUT of the negative output power module N1 is connected to a pin 2 of the optocoupler N3 and an anode of the voltage stabilizing diode VD 1. The capacitor C1 is connected across pin 1 and pin 2 of the optocoupler N3. And a pin 3 of the optocoupler N3 is connected with an input ground terminal GND1 of the positive output power module N2, and a pin 4 of the optocoupler N3 is connected with an enable terminal EN of the positive output power module N2.
The working principle of the power-on time sequence control method of the positive and negative output combined power supply is as follows: when the power supply is connected to the negative output power module N1 and the positive output power module N2 at the same time, the negative output power module N1 starts immediately to output a negative voltage, but the positive output power module N2 does not output a positive voltage for the moment because its enable terminal is not enabled. The negative voltage output by the negative output power module N1 is limited by a resistor R1, and is charged by a capacitor C1 after being stabilized by a voltage stabilizing diode VD1, the voltage at two ends of the capacitor C1 reaches the conduction voltage of a pin 1 and a pin 2 of the optical coupler N3 after the time t, a current conduction state is formed between the pin 1 and the pin 2, and then a pin 3 and a pin 4 of the optical coupler are in a conduction state, so that the enabling end of the positive output power module N2 is pulled to a low level, the positive output power module N2 is enabled, and the positive output power module N2 outputs a positive voltage. Thereby realizing that the negative voltage is output before the positive voltage. The resistance of the resistor R1 and the capacitance of the capacitor C1 can be adjusted properly, and the time interval of outputting the negative voltage is prior to the time interval of outputting the positive voltage.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A combined power supply is characterized by comprising a negative output power supply module N1 and a positive output power supply module N2;
the input end VIN and the power ground end GND1 end of the negative output power module N1 are respectively and correspondingly connected to the input power positive end and the ground end of the power supply; the output end VOUT and the ground wire end GND2 of the negative output power supply module N1 are respectively connected to a negative power supply load;
an input end VIN and a power ground end GND1 end of the positive output power module N2 are respectively and correspondingly connected to an input power supply positive end and a ground end of the power supply; the output end VOUT and the ground end GND2 of the positive output power supply module N2 are respectively connected to a positive power supply load;
the ground wire end GND2 of the negative output power module N1 and the positive output power module N2 are connected;
the positive output power module N2 has an enable terminal; the positive output power module delays to output a positive voltage after the negative output power module outputs a negative voltage by outputting an enable signal to an enable terminal through a delay unit connected between an output terminal VOUT of the negative output power module N1 and an output ground terminal.
2. The combined power supply of claim 1, wherein the delay unit comprises an optical coupler N3, a resistor R1, a capacitor C1 and a voltage stabilizing diode VD 1;
an output ground wire end GND2 of the negative output power module N1 is connected to a cathode of a voltage stabilizing diode VD1 and one input end of an optocoupler N3 through a resistor R1, and an output end VOUT of the negative output power module N1 is connected to the other input end of the optocoupler N3 and an anode of the voltage stabilizing diode VD 1; one output end of the optocoupler N3 is connected with an enable end EN of the positive output power supply module N2, and one output end of the optocoupler N3 is connected with an input ground end GND1 of the positive output power supply module N2; and a capacitor C1 is connected between the two input ends of the optical coupler N3.
3. The combination power supply of claim 1, wherein the enable signal at the enable terminal of the positive output power module N2 is low to trigger the positive output power module N2 to enable the positive voltage.
4. A power-on time sequence control method of a combined power supply is characterized in that the positive end and the ground end of an input power supply of a power supply are correspondingly connected with the input end VIN and the power ground end of a negative output power supply module N1 and a positive output power supply module N2 at the same time, and the negative output power supply module N1 is immediately started to output negative voltage;
the enable end of the positive output power module N2 is not triggered to be enabled, and no output signal exists;
the negative voltage output by the negative output power module N1 is delayed by the delay unit and triggers the enable terminal of the positive output power module N2, so that the positive output power module N2 outputs a positive voltage.
5. The power-on sequence control method of the combined power supply as claimed in claim 4, wherein the delay unit comprises an optocoupler N3, a resistor R1, a capacitor C1 and a voltage regulator diode VD 1;
an output ground wire end GND2 of the negative output power module N1 is connected to a cathode of a voltage stabilizing diode VD1 and one input end of an optocoupler N3 through a resistor R1, and an output end VOUT of the negative output power module N1 is connected to the other input end of the optocoupler N3 and an anode of the voltage stabilizing diode VD 1; one output end of the optocoupler N3 is connected with an enable end EN of the positive output power supply module N2, and one output end of the optocoupler N3 is connected with an input ground end GND1 of the positive output power supply module N2; and a capacitor C1 is connected between the two input ends of the optical coupler N3.
6. The power-on timing sequence control method of the combined power supply of claim 5, wherein the negative voltage outputted by the negative output power module N1 is current-limited by a resistor R1 and is stabilized by a voltage stabilizing diode VD1 to charge a capacitor C1, and after a time t, the voltage across the capacitor C1 reaches the conduction voltage across the two input terminals of the optocoupler N3, so that a current conduction state is formed between the two input terminals, and the two output terminals of the optocoupler are made to form a conduction state, so that the enable terminal of the positive output power module N2 is pulled to a low level, the positive output power module N2 is triggered to enable, and the positive output power module N2 outputs a positive voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010912964.9A CN111983957A (en) | 2020-09-03 | 2020-09-03 | Combined power supply and power-on time sequence control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010912964.9A CN111983957A (en) | 2020-09-03 | 2020-09-03 | Combined power supply and power-on time sequence control method thereof |
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| CN111983957A true CN111983957A (en) | 2020-11-24 |
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Citations (8)
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| CN103280968A (en) * | 2013-05-09 | 2013-09-04 | 中国电子科技集团公司第二十四研究所 | Timing control circuit of pulse power supply |
| CN203587996U (en) * | 2013-09-29 | 2014-05-07 | 广东电网公司佛山供电局 | Multipath combined power output sequential control device |
| CN203658754U (en) * | 2013-11-26 | 2014-06-18 | 洛阳隆盛科技有限责任公司 | Output power-on time sequence control circuit |
| CN206099930U (en) * | 2016-09-30 | 2017-04-12 | 洛阳隆盛科技有限责任公司 | DC DC module power -on sequence control circuit |
| CN208257783U (en) * | 2018-06-13 | 2018-12-18 | 河南森源电气股份有限公司 | A kind of more power supply electrifying sequential control circuits |
| JP2018207709A (en) * | 2017-06-07 | 2018-12-27 | 住友電気工業株式会社 | Display processor, display processing method and display processing program |
| CN209014935U (en) * | 2018-08-20 | 2019-06-21 | 合肥华耀电子工业有限公司 | A kind of switching on and shutting down sequential control circuit with interlock function |
| CN210898926U (en) * | 2019-09-18 | 2020-06-30 | 陕西中科天地航空模块有限公司 | Switching power supply output load discharge circuit |
-
2020
- 2020-09-03 CN CN202010912964.9A patent/CN111983957A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280968A (en) * | 2013-05-09 | 2013-09-04 | 中国电子科技集团公司第二十四研究所 | Timing control circuit of pulse power supply |
| CN203587996U (en) * | 2013-09-29 | 2014-05-07 | 广东电网公司佛山供电局 | Multipath combined power output sequential control device |
| CN203658754U (en) * | 2013-11-26 | 2014-06-18 | 洛阳隆盛科技有限责任公司 | Output power-on time sequence control circuit |
| CN206099930U (en) * | 2016-09-30 | 2017-04-12 | 洛阳隆盛科技有限责任公司 | DC DC module power -on sequence control circuit |
| JP2018207709A (en) * | 2017-06-07 | 2018-12-27 | 住友電気工業株式会社 | Display processor, display processing method and display processing program |
| CN208257783U (en) * | 2018-06-13 | 2018-12-18 | 河南森源电气股份有限公司 | A kind of more power supply electrifying sequential control circuits |
| CN209014935U (en) * | 2018-08-20 | 2019-06-21 | 合肥华耀电子工业有限公司 | A kind of switching on and shutting down sequential control circuit with interlock function |
| CN210898926U (en) * | 2019-09-18 | 2020-06-30 | 陕西中科天地航空模块有限公司 | Switching power supply output load discharge circuit |
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Application publication date: 20201124 |